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Acoustic signal transmission with insertion signal for machine control
Inactive Publication Date: 2005-09-20
NIPPON TELEGRAPH & TELEPHONE CORP
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Summary
Abstract
Description
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[0011]Therefore, an object of the present invention is to provide means to easily transmit sounds (audible sound signals) that can be heard by humans and animals and to simultaneously transmit associated information signals. Also, the present invention has an object to provide various systems based on the information transmission means.
Problems solved by technology
That is, a total of more than two apparatuses are necessary, and complexity in the overall apparatus configuration is unavoidable.
Also, apart from this problem, although there are methods of signal transmission based on ultrasonic waves as carrier waves, because ultrasonic sounds cannot be heard by human ears, it is necessary to convert to an audible sound at the receiver side, and the method cannot be used for the above purpose.
However, according to this method, sounds that are not needed to be heard and are not of any interest to humans can be heard clearly as background noise.
Therefore, it is very disturbing, and possibilities exist of misunderstanding the intended meaning of the original sounds represented by the audible sound signals.
Therefore, such methods cannot be said to be suitable as sound-based information transfer means.
Method used
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embodiment 1
[0087]First, examples in Embodiment 1 will be explained.
[0088]FIGS. 1A and 1B are diagrams to show Embodiment 1 of the present invention, and numeric symbol 1A refers to the sending side and 1B refers to the receiving side. In FIG. 1A, numeric symbol 1 represents audible sound signal, 2 an insertion signal, which is another signal different than the audible sound signal 1, and 3 a synthesized sound electrical signal.
[0089]Although the following explanations relate to a case of using a digital signal for signal 2, but even if the signal 2 is an analogue signal, once the signal has been converted to digital information by processing the signal through an A / D converter, it is obvious that it can be handled in the same manner as digital signals.
[0090]Also, 4 represents a synthesizing apparatus, 5 an amplifier (in FIG. 1A, it is recited as AMP), 6 a speaker, 7 a synthesized sound, 8 a person. In FIG. 1B, numeric symbol 9 represents a microphone, 10 an extraction apparatus, and other nume...
embodiment 2
[0108]FIG. 6 shows Embodiment 2 of the present invention, which shows both the sending side and the receiving side. In the diagram, numeric symbol 1 represents an audible sound signal; 2 a signal different than the audible sound signal; 3 a synthesized sound electrical signal; 4b a synthesizing apparatus; 6 a speaker; 7 a synthesized sound; 8 a person; 10 an extraction apparatus; 11 a sending apparatus; 12 a signal transmission path; and 13 a receiving apparatus.
[0109]An outline of the flow of the signal in FIG. 6 will be explained. A feature of the present embodiment is that, as illustrated in the diagram by a dotted line, there is a means for transmitting (signal transmission path 12) the synthesized sound 7 from the sending side to the receiving side directly without propagating through the air space. In this case, an advantage is that, because acoustic noise in the air space is not mixed in the sending signal, reliability of signal transmission is increased. Also, at the same ti...
embodiment 3
[0130]Embodiment 3 will be explained in the following. In Embodiment 3, a voice response machine that can respond to audio control signals is realized by applying the present invention to machine control.
[0131]Media for enabling wirelessremote control, without connecting a machine to be controlled and a control apparatus directly by means of conductive wires, such as electrical waves, infraredradiation, light and sound waves, have long been known and used. Of these, a representative method using sound waves in the audible frequency band is a based on commands comprised by synthesized sound signals that can be processed readily by machines.
[0132]Such methods based on commands by synthesized sound signals that can be easily understood by machines have the advantage that recognition rate is higher than a method based on natural language, but the commands are difficult to be understood directly by humans.
[0133]For this reason, in a communication air space in which machines and humans ...
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Abstract
The acoustic signal transmission includes electrically synthesizing an audible sound signal and an insertionsignal to generate a synthesized sound electrical signal at the sending side, transmitting the synthesized sound electrical signal, and extracting the insertion signal form the synthesized sound electrical signal at the receiving side. The extracted signal may be used for controlling machines or for transmitting information. The acoustic signal represented by the synthesized sound electrical signal can be heard by human ears in the same way as the audible sound signal, while the synthesized insertion signal cannot be detected by human ears. The synthesized sound electrical signal can be transmitted as a sound wave in air space, as electrical signals through a transmission line or as radio signals such as infrared and electromagnetic waves. The synthesized sounds may also be transported or distributed by recording on recording media such as compact disc and DVD.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an acoustic transmission method and an apparatus for transmitting signals using sound waves as the transport medium.[0003]This application is based on patent application Nos. Hei 11-329914, Hei 11-356827. Hei 11-363811, Hei 11-366345, Hei 11-366346, 2000-136716, 2000-136717, 2000-248800 filed in Japan, the contents of which are incorporated herein by reference.[0004]2. Description of the Related Art[0005]Conventionally, when transmitting the sound that can be heard by humans or animals (audible sound signals) and associated information signals concurrently to some machine, the audible signal and the associated information signal are sent through separate channels.[0006]For example, audible signal and information signal are sent as electrical signal to modulate the carrier wave, and are sent to the receiver side through electromagnetic waves and other media such as cables, and are used af...
Claims
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Application Information
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